Haproxy 2.4 opentracing extract/use already existent x-b3-traceid header

is there a way for create a span child of an already exixtent x-b3-traceid header?

the header is sent from an outside component, but i’m unable to create a span child of the trace that was created outside (extract require a context, but x-b3-traceid have no context, is it right?)

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